//
//  NSString+JHMD5.m
//  练习MD5加密
//
//  Created by 苗钧豪 on 16/8/16.
//  Copyright © 2016年 苗钧豪. All rights reserved.
//

#import "NSString+JHMD5.h"
#import <CommonCrypto/CommonCrypto.h>
@implementation NSString (JHMD5)
- (NSString *)stringWith32BitMD5 {
    // 1.将字符串转换成C语言字符串
    const char *cString = [self UTF8String];
    // 2.将C的字符串转换 MD5
    CC_LONG length = (CC_LONG)strlen(cString);
    unsigned char bytes[CC_MD5_DIGEST_LENGTH];
    CC_MD5(cString, length, bytes);
    // 3.将C的字符串转换成OC的字符串
    NSMutableString *string = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i ++) {
        [string appendFormat:@"%02x",bytes[i]];
    }
    return string;
}

- (NSString *)stringWith32BitMD5Lower {
    return [[self stringWith32BitMD5] lowercaseString];
}

- (NSString *)stringWith32BitMD5Upper {
    
    return [[self stringWith32BitMD5] uppercaseString];
}

- (NSString *)stringWith16BitMD5 {
    NSString *str = [self stringWith32BitMD5];
    NSString *string = [str substringFromIndex:str.length - 8];
    string = [string substringFromIndex:8];
    return string;;
}

- (NSString *)stringWith16BitMD5Lower {
    return [[self stringWith16BitMD5] lowercaseString];
}

- (NSString *)stringWith16BitMD5Upper {
    return [[self stringWith16BitMD5] uppercaseString];
}
@end
